Adjfarisi, Affan Ramadhani (2026) Analisis Pengaruh Jenis Coating Fosfat, Silika, Dan Resin Fenolik Terhadap Karakteristik Fisik Dan Magnetik Pada Soft Magnetic Composite Berbasis Besi Nitrida. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Perkembangan teknologi elektromagnetik mendorong kebutuhan akan material magnetik yang memiliki efisiensi tinggi, stabilitas termal yang baik, serta mampu bekerja pada frekuensi menengah hingga tinggi. Soft Magnetic Composite (SMC) menjadi salah satu material yang banyak dikembangkan karena memiliki sifat isotropik, resistivitas listrik tinggi, dan rugi arus eddy yang rendah. Salah satu pendekatan yang berpotensi dikembangkan adalah pemanfaatan besi nitrida sebagai material dasar SMC karena sifat feromagnetik yang baik serta ketahanan terhadap oksidasi. Penelitian ini bertujuan untuk menganalisis pengaruh variasi jenis coating, yaitu fosfat, silika, dan resin fenolik, terhadap karakteristik fisik dan magnetik SMC berbasis besi nitrida. Serbuk Fe3O4 terlebih dahulu disintesis melalui metode kopresipitasi untuk memperoleh ukuran partikel nanometer, kemudian dilakukan proses nitridasi menggunakan NH3 pada temperatur 650 oC selama 4 jam untuk membentuk fasa Fe-N. Serbuk hasil nitridasi selanjutnya dilapisi menggunakan coating fosfat, silika, dan resin fenolik, kemudian mixing dengan binder dan lubrikan, dikompaksi pada tekanan 500 MPa, serta diberi perlakuan panas sesuai karakteristik masing-masing coating. Karakterisasi dilakukan menggunakan X-Ray Diffraction (XRD), Scanning Electron Microscopy-Energy Dispersive X-Ray Spectroscopy (SEM-EDS), Fourier Transform Infrared Spectroscopy (FTIR), dan Vibrating Sample Magnetometer (VSM). Hasil XRD menunjukkan bahwa proses pelapisan tidak membentuk fasa kristal baru, sehingga lapisan yang terbentuk bersifat amorf. Keberadaan coating dibuktikan melalui FTIR dengan teridentifikasinya gugus P-O-P pada coating fosfat, Si-O-Si pada coating silika, dan gugus C-H pada coating resin fenolik. Analisis SEM-EDS menunjukkan bahwa adanya unsur penyusun coating dengan distribusi tingkat keseragaman yang berbeda pada setiap jenis coating. Hasil pengujian VSM menunjukkan variasi jenis coating memberikan pengaruh yang signifikan terhadap sifat magnetik SMC. SMC dengan lapisan fosfat menunjukkan nilai saturasi magnet (Ms) tertinggi sebesar 20,331 emu/g dan koersivitas (Hc) terendah sebesar 17,618 Oe, sedangkan coating resin fenolik dengan Ms bernilai 11,650 emu/g dan Hc bernilai 35,159 Oe, sedangkan coating silika dengan Ms sebesar 9,2837 emu/g dan Hc sebesar 50,852 Oe. Perbedaan ini dipengaruhi oleh fraksi material non-magnetik dan homogenitas coating. Secara keseluruhan, jenis coating berperan penting dalam menentukan karakteristik fisik dan magnetik SMC, dengan coating fosfat menunjukkan performa magnetik paling baik pada penelitian ini.
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Advances in electromagnetic technology have driven the need for magnetic materials that are highly efficient, thermally stable, and capable of operating at medium to high frequencies. Soft Magnetic Composite (SMC) has become one of the most widely developed materials due to its isotropic properties, high electrical resistivity, and low eddy current losses. One potential development approach is to use iron nitride as the base material for SMC owing to its good ferromagnetic properties and resistance to oxidation. This study aims to analyse the effect of coating types (phosphate, silica, and phenolic resin on the physical and magnetic characteristics of iron nitride-based SMC. Fe3O4 powder was first synthesised through the coprecipitation method to obtain nanometre-sized particles, then nitrided using NH3 at a temperature of 650 °C for 4 hours to form the Fe-N phase. The nitrided powder was then coated with phosphate, silica, and phenolic resin, mixed with a binder and lubricant, compacted at a pressure of 500 MPa, and heat-treated according to the characteristics of each coating. Characterisation was performed using X-Ray Diffraction (XRD), Scanning Electron Microscopy-Energy Dispersive X-Ray Spectroscopy (SEM-EDS), Fourier Transform Infrared Spectroscopy (FTIR), and Vibrating Sample Magnetometer (VSM). The XRD results showed that the coating process did not form a new crystalline phase, thus, the formed coating was amorphous. The presence of the coating was confirmed by FTIR with the identification of P-O-P groups in the phosphate coating, Si-O-Si in the silica coating, and C-H groups in the phenolic resin coating. SEM-EDS analysis revealed the presence of coating components with different levels of uniformity distribution in each type of coating. The VSM test results show that the type of coating has a significant effect on the magnetic properties of SMC. SMC with a phosphate coating showed the highest magnetic saturation (Ms) value of 20.331 emu/g and the lowest coercivity (Hc) of 17.618 Oe, while phenolic resin coating had an Ms value of 11.650 emu/g and an Hc value of 35.159 Oe, and silica coating had an Ms of 9.2837 emu/g and an Hc of 50.852 Oe. These differences were influenced by the nonmagnetic material fraction and coating homogeneity. Overall, the type of coating plays an important role in determining the physical and magnetic characteristics of SMC, with phosphate coating showing the best magnetic performance in this study.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Soft Magnetic Composite, Iron Nitride, Coating Soft Magnetic Composite, Besi Nitrida, Coating |
| Subjects: | Q Science > QC Physics > QC765 Magnetic materials |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Affan Ramadhani Adjfarisi |
| Date Deposited: | 03 Feb 2026 02:25 |
| Last Modified: | 03 Feb 2026 02:25 |
| URI: | http://repository.its.ac.id/id/eprint/131810 |
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